| 
                     
                        | (84) | Designated Contracting States: |  
                        |  | AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
                           NO PL PT RO RS SE SI SK SM TR |  
                        |  | Designated Extension States: |  
                        |  | BA ME |  
                        |  | Designated Validation States: |  
                        |  | KH MA MD TN |  
 
                     
                        | (30) | Priority: | 16.05.2018 US 201815981532 
 |  
 
                     
                        | (71) | Applicant: Chevron Phillips Chemical Company LP |  
                        |  | The Woodlands, Texas 77380 (US) |  
 | 
                     
                        | (72) | Inventors: |  
                        |  | 
                              DOOLEY, Kenneth A.Porter, Texas 77365 (US)
LOWELL, Jeffrey S.Huffman, Texas 77336 (US)
CURREN, Joseph A.Kingwood, Texas 77339 (US)
 |  
 
                     
                        | (74) | Representative: Privett, Marianne Alice Louise |  
                        |  | A.A. Thornton & Co. 
                           Octagon Point 
                           5 Cheapside London EC2V 6AA
 London EC2V 6AA (GB)
 |  
 |